EP2233153B1 - Vaccin anti-rotavirus inducteur de protection croisée hétérotipique - Google Patents

Vaccin anti-rotavirus inducteur de protection croisée hétérotipique Download PDF

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EP2233153B1
EP2233153B1 EP10159949.6A EP10159949A EP2233153B1 EP 2233153 B1 EP2233153 B1 EP 2233153B1 EP 10159949 A EP10159949 A EP 10159949A EP 2233153 B1 EP2233153 B1 EP 2233153B1
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rotavirus
vaccine
composition
use according
strain
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EP2233153A1 (fr
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Brigitte Desiree Alberte Colau
Beatrice Arsene Virginie De Vos
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GlaxoSmithKline Biologicals SA
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GlaxoSmithKline Biologicals SA
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Priority claimed from GB0521164A external-priority patent/GB0521164D0/en
Priority claimed from GB0608962A external-priority patent/GB0608962D0/en
Priority to SI200631912T priority Critical patent/SI2233153T1/sl
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Priority to PL10159949T priority patent/PL2233153T3/pl
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/12—Viral antigens
    • A61K39/15—Reoviridae, e.g. calf diarrhea virus
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/12—Viral antigens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/12—Antidiarrhoeals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/14—Antivirals for RNA viruses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/51—Medicinal preparations containing antigens or antibodies comprising whole cells, viruses or DNA/RNA
    • A61K2039/52—Bacterial cells; Fungal cells; Protozoal cells
    • A61K2039/522—Bacterial cells; Fungal cells; Protozoal cells avirulent or attenuated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/51—Medicinal preparations containing antigens or antibodies comprising whole cells, viruses or DNA/RNA
    • A61K2039/525—Virus
    • A61K2039/5254—Virus avirulent or attenuated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/54—Medicinal preparations containing antigens or antibodies characterised by the route of administration
    • A61K2039/541—Mucosal route
    • A61K2039/542—Mucosal route oral/gastrointestinal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/545—Medicinal preparations containing antigens or antibodies characterised by the dose, timing or administration schedule
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
    • A61K2039/55505—Inorganic adjuvants
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2720/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA dsRNA viruses
    • C12N2720/00011—Details
    • C12N2720/12011—Reoviridae
    • C12N2720/12311—Rotavirus, e.g. rotavirus A
    • C12N2720/12334—Use of virus or viral component as vaccine, e.g. live-attenuated or inactivated virus, VLP, viral protein

Definitions

  • This invention relates to rotavirus vaccine formulations.
  • the invention relates to the use of an attenuated rotavirus population from one rotavirus type in the prevention of disease associated with rotavirus infection from another rotavirus type.
  • Acute, infectious diarrhoea is a leading cause of disease and death in many areas of the world. In developing countries, the impact of diarrhoeal disease is staggering. For Asia, Africa and Latin America, it has been estimated that there are between 3-4 billion cases of diarrhoea each year and of those cases about 5-10 million result in death ( Walsh, J.A. et al.: N. Engl. J. Med., 301:967-974 (1979 )).
  • Rotaviruses have been recognised as one of the most important causes of severe diarrhoea in infants and young children ( Estes, M.K. Rotaviruses and Their Replication in Fields Virology, Third Edition, edited by Fields et al., Raven Publishers, Philadelphia, 1996 ). It is estimated that rotavirus disease is responsible for over one million deaths annually. Rotavirus-induced illness most commonly affects children between 6 and 24 months of age, and the peak prevalence of the disease generally occurs during the cooler months in temperate climates, and year-round in tropical areas. Rotaviruses are typically transmitted from person to person by the faecal-oral route with an incubation period of from about 1 to about 3 days.
  • neonates are generally asymptomatic or have only mild disease. In contrast to the severe disease normally encountered in young children, most adults are protected as a result of previous rotavirus infection so most adult infections are mild or asymptomatic ( Offit, P.A. et al. Comp. Ther., 8(8):21-26, 1982 ).
  • Rotaviruses are generally spherical, and their name is derived from their distinctive outer and inner or double-shelled capsid structure.
  • the double-shelled capsid structure of a rotavirus surrounds an inner protein shell or core that contains the genome.
  • the genome of a rotavirus is composed of 11 segments of double-stranded RNA which encode at least 11 distinct viral proteins. Two of these viral proteins designated as VP4 and VP7 are arranged on the exterior of the double-shelled capsid structure.
  • the inner capsid of the rotavirus presents one protein, which is the rotavirus protein designated VP6. The relative importance of these three particular rotaviral proteins in eliciting the immune response that follows rotavirus infection is not yet clear.
  • VP6 protein determines the group and subgroup antigen
  • VP4 and VP7 proteins are the determinants of serotype (types determined by neutralisation assay) and genotype (types determined by a non-serological assay) specificity.
  • the designations for G serotypes and G genotypes are identical.
  • the numbers assigned for P serotypes and genotypes are different ( Santos N. et Hoshino Y., 2005, Reviews in Medical Virology, 15, 29-56 ). Therefore the P serotype is designated as P followed by assigned number, and the P genotype is designated by a P followed by assigned number in brackets.
  • VP7 protein is a 38,000 MW glycoprotein (34,000 MW when non-glycosylated) which is the translational product of genomic segment 7, 8 or 9, depending on the strain. This protein stimulates formation of the neutralising antibody following rotavirus infection.
  • VP4 protein is a non-glycosylated protein of approximately 88,000 MW which is the translational product of genomic segment 4. This protein also stimulates neutralising antibody following rotavirus infection.
  • VP4 and VP7 proteins are the viral proteins against which neutralising antibodies are directed, they are believed to be prime candidates for development of rotavirus vaccines, affording protection against rotavirus illness.
  • a live attenuated rotavirus vaccine is thus highly desirable.
  • this should be an oral vaccine, as this is the natural route of infection of the virus.
  • a rotavirus strain known as 89-12 has been described by Ward; see US Patent Number 5,474,773 and Bernstein, D.L. et al, Vaccine, 16 (4), 381-387, 1998 .
  • the 89-12 strain was isolated from a stool specimen collected from a 14 month-old child with natural rotavirus illness in 1988.
  • the HRV 89-12 human rotavirus was then culture-adapted by 2 passages in primary African Green Monkey Kidney (AGMK) cells and 4 passages in MA-104 cells as described by Ward in J. Clin. Microbiol., 19, 748-753, 1984 . It was then plaque purified 3 times in MA-104 cells (to passage 9) and grown after 2 additional passages in these cells.
  • One additional passage was made (passage 12) for deposition with the ATCC under the accession number ATCC VR 2272.
  • the deposited strain is known as 89-12C2.
  • the 1998 paper in Vaccine by Bernstein et al is referred to below as the Vaccine (1998) paper.
  • the paper describes the safety and immunogenicity of an orally administered live human rotavirus vaccine candidate. This vaccine was obtained from strain 89-12, attenuated by passaging without plaque purification 26 times in primary AGMK cells and then another 7 times in an established AGMK cell line (33 passages in total).
  • P26 rotavirus derived by passaging 89-12 n times
  • P33 rotavirus derived by passaging 89-12 n times
  • P26 population described in the literature comprises a mixture of variants. This has been established by genetic characterisation as described hereinbelow (see examples). P26 is therefore not a reliably consistent population for further passages, in particular for the production of vaccine lots. Similarly, P33 comprises a mixture of variants and is not reliably consistent for the production of vaccine lots.
  • the P26 material is a mixture of at least three VP4 gene variants.
  • P33 and P38 are similarly a mixture of two variants. These variants appear to be antigenically different, in terms of neutralising epitopes, to the 89-12C2 strain deposited at the ATCC when evaluating the neutralizing antibody titers of sera from infants vaccinated with P33 against these variants.
  • WO 01/12797 discloses a method of separating rotavirus variants and an improved live attenuated rotavirus vaccine derived from a cloned (homogeneous) human rotavirus strain. Also disclosed is an attenuated rotavirus population (isolate), characterised in that it comprises a single variant or substantially a single variant, said variant defined by the nucleotide sequence encoding at least one of the major viral proteins designated as VP4 and VP7.
  • Protective efficacy of such an oral attenuated human rotavirus vaccine against G9 heterologous strain has been reported in Latin American infants ( Perez et al.
  • WO 05/021033 discloses that one rotavirus serotype may be used to protect against disease caused by another serotype.
  • WO 05/021033 discloses the use of a G1 rotavirus population, [for example as deposited at the European Collection of Animal Cell Cultures (ECACC), Vaccine Research and Production Laboratory, Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire, SP4 OJG, United Kingdom on 13 August 1999 under the deposition number 99081301, under the terms of the Budapest Treaty, also named P43 or RIX4414], to prevent disease caused by both G1 and at least one non-G1 rotavirus serotype, such as but not limited to the G2, G3, G4 and G9 rotavirus serotypes.
  • an attenuated rotavirus population for example one such as characterised in WO 01/12797 , can be used as a vaccine to provide cross protection against disease caused by rotavirus infection of a different type (serotype and/or genotype) to that used in the vaccine.
  • the VP7 protein specifies the G type (serotype), and the VP4 protein specifies the P type of strain (serotype or genotype).
  • the present disclosure relates to the use of an attenuated rotavirus population from one P type in the prevention of disease associated with rotavirus infection from a different P type, and specifically to the use of an attenuated rotavirus population or strain from a GxPy type in the induction of an immune response and/or in the prevention of disease associated with rotavirus infection caused by a rotavirus strain which is neither a Gx nor a Py type.
  • Immunity may be measured by neutralising antibody responses to the vaccine or by serum rotavirus IgA antibody response, such as seroconversion factor (i.e. ⁇ 3-fold increase in serum antibody IgA levels following vaccination, as described in Ward et al., 1990, J. Infect. Disease, 161, 440-445 ).
  • seroconversion factor i.e. ⁇ 3-fold increase in serum antibody IgA levels following vaccination, as described in Ward et al., 1990, J. Infect. Disease, 161, 440-445 ).
  • Gx will refer to a specific G type, i.e. G genotype or G serotype (both terminologies being identical), whilst Py terminology will generically refer to a specific P type, either P serotype (e.g. P8, P4) or P genotype (e.g. P[4], P[8]).
  • P serotype e.g. P8, P4
  • P genotype e.g. P[4], P[8]
  • an attenuated rotavirus strain from a G1 P[8] type in the manufacture of a composition for conferring protection against rotavirus infection caused by a rotavirus strain of a G2P[4] type.
  • G1P[8] rotavirus population for example G1 P[8] as deposited at the European Collection of Animal Cell Cultures (ECACC), Vaccine Research and Production Laboratory, Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire, SP4 0JG, United Kingdom on 13 August 1999 under the deposition number 99081301, under the terms of the Budapest Treaty
  • ECACC European Collection of Animal Cell Cultures
  • Vaccine Research and Production Laboratory Public Health Laboratory Service
  • Centre for Applied Microbiology and Research Porton Down, Salisbury, Wiltshire, SP4 0JG, United Kingdom on 13 August 1999 under the deposition number 99081301, under the terms of the Budapest Treaty
  • a G1P[8] rotavirus population for example G1 P[8] as deposited at the European Collection of Animal Cell Cultures (ECACC), Vaccine Research and Production Laboratory, Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire,
  • G1P[8] rotavirus population can be used to prevent disease caused by both one G1 P[8] and at least one non- G1P[8] genotypes, such as G2P[4] rotavirus genotype.
  • the present disclosure relates to use of an attenuated rotavirus population from one rotavirus type in the prevention of disease associated with rotavirus infection from another rotavirus type, wherein the type is suitably defined by reference to the sequence of the rotavirus VP4 protein (P type).
  • the disclosure also relates to the use of an attenuated rotavirus population from one rotavirus strain (defined by both a specific G and P type) in the prevention of disease associated with rotavirus infection from another rotavirus strain, wherein the strain is suitably defined by reference to the sequence of both the rotavirus VP4 protein (P type) and VP7 protein (G type).
  • said immune response is a protective immune response.
  • the rotavirus population may comprise VP4 and/or VP7 viral proteins from ECACC deposit 99081301 suitable to provide a cross protective effect.
  • cross-protection is the protection afforded by a rotavirus type against infection caused by a rotavirus of a different type.
  • Cross-protection can be homotypic or heterotypic.
  • Homotypic cross-protection is a protection afforded by a rotavirus strain against a strain of either a G or a P type, such as for example a G1P[8] strain affording cross-protection against a non-G1, P[8] strain (e.g. G2P[8]) via the P[8] type.
  • homotypic cross-protection is that afforded by a G1P[8] strain against a G1 non-P[8] strain (e.g. G1 P[4]) via the G1 type.
  • Heterotypic cross-protection is a protection afforded by a rotavirus strain against a rotavirus strain of different P and G types such as for example the protection afforded by a G1P[8] against a non G1- non P[8]- strain (e.g. G2P[4]) (heterotypic protection afforded via both G and P types).
  • G1 attenuated rotavirus population from a G1P[8] type [for example as deposited at the European Collection of Animal Cell Cultures (ECACC), Vaccine Research and Production Laboratory, Public Health Laboratory Service, Centre for Applied Microbiology and Research, Porton Down, Salisbury, Wiltshire, SP4 0JG, United Kingdom on 13 August 1999 under the deposition number 99081301, under the terms of the Budapest Treaty], can be used to prevent disease caused by G1P[8] and at least one, non-G1 rotavirus serotypes selected from the group consisting of: G3, G4, and G9.
  • the vaccine composition for use according to the invention comprises a G1 P[8] rotavirus strain and is capable of inducing an immune response to a G2P[4] rotavirus strain.
  • the disclosure relates to a method of inducing an immune response against rotavirus strain, the method comprising administering to a subject a composition comprising an attenuated rotavirus strain of a GxPy type, said composition generating an immune response against a rotavirus strain which is neither a Gx nor a Py type.
  • the rotavirus population within the vaccine composition is of G1P1A (i.e. G1P[8] according to the current nomenclature) strain specificity.
  • the rotavirus population comprises VP4 and/or VP7 viral proteins from ECACC deposit 99081301 suitable to elicit an immune response and, typically, provide a cross protective eflect.
  • the invention relates to G1P[8] rotavirus strains in methods or uses as described above.
  • the rotavirus vaccine used is the ECACC deposit 99081301, or is derived from that deposit.
  • the vaccine induces a cross-protective immune response or cross-protection against gastro-enteritis in a vaccinated individual compared to the unvaccinated individual (from the placebo group).
  • the vaccine provides cross-protection against rotavirus infection symptoms such as diarrhea or gastro-enteritis.
  • gastro-enteritis may be defined as diarrhea characterised by three or more, watery or looser than normal, stools within a day, or forceful vomiting along with the detection of rotavirus in the examined stool specimen.
  • protective immune response is meant an immune response which leads to a reduction of the severity of clinical symptoms associated with rotavirus infection or that leads to reduced susceptibility to rotavirus infection.
  • Disease severity in an unvaccinated or a vaccinated individual may be graded according to published scoring systems such as the 20-point Vesikari scale or a slightly amended version of said method ( Ruuska T et al. Scand. J. Infect. Dis.
  • the disclosure describes a use as detailed above wherein the composition comprising an attenuated rotavirus strain of a GxPy type induces a cross-protective immune response and/or protection against rotavirus-induced gastro-enteritis, suitably against severe rotavirus-induced gastroenteritis, caused by infection of a rotavirus strain which is neither a Gx nor a Py type.
  • said protective immune response is capable of reducing the severity of the disease or eliminate rotavirus induced disease as measured according to any suitable scoring system.
  • composition according to the invention to reduce the severity of the disease, e.g. gastroenteritis, or to eliminate rotavirus induced disease, said disease severity or disease being recorded according to any suitable scoring system as taught above.
  • said composition is up to 60% protective, suitably up to 81% protective, in a population of vaccinated individuals, against diarrhoea caused by infection of a rotavirus of a different type to that of the attenuated rotavirus present in the composition.
  • said composition is at least 40% protective, suitably at least 50% protective, in a population of vaccinated individuals, against diarrhoea caused by a rotavirus strain which is of a G2P[4] type.
  • said composition is between 40% and 80% protective, suitably between 50% and 70% protective against diarrhoea caused by a rotavirus strain which is of a G2P[4] type.
  • said composition comprises a G1P[8] rotavirus strain which affords the level of protection as mentioned above against gastro-enteritis caused by infection of rotavirus strains of G2P[4] type.
  • the protection rate against diarrhoea and/or gastro-enteritis and/or severe gastro-enteritis achieved in a population of vaccinated individuals infected by a rotavirus strain which is neither a Gx nor a Py type may be between 10 to 90%, suitably between 20 to 80%, suitably between 40% and 80%, suitably between 45% and 75% protective.
  • the level of protection against severe gastro-enteritis is at least 40%, suitably at least 50%.
  • said composition comprises a G1P[8] rotavirus strain which is between 45% and 75% protective, in a population of vaccinated individuals against severe gastro-enteritis, as measured according to the Vesikari score, caused by infection of rotaviruses of with a G2P[4] serotype.
  • the vaccine is used in a 2 dose or a 3 dose regime.
  • the composition for use according to the invention is administered in a 2 dose regime.
  • the rotavirus vaccine used to give cross protection has the following suitable features.
  • the G1P[8] rotavirus of the composition for use according to the invention has a VP4 gene comprising a nucleotide sequence comprising at least one of the following: an adenine base (A) at position 788, an adenine base (A) at position 802 and a thymine base (T) at position 501 from the start codon.
  • the G1P[8] rotavirus of the composition for use according to the invention has a VP7 gene comprising a nucleotide sequenece comprising at least one of the following: a thymine (T) at position 605, an adenine (A) at position 897, or a guanine (G) at position 897 from the start codon.
  • a thymine (T) at position 605
  • A adenine
  • G guanine
  • the G1P[8] rotavirus of the composition for use according to the invention has an adenine (A) at positions 788 and 802 and a thymine (T) at position 501 from the start codon in the VP4 gene sequence.
  • the G1P[8] rotavirus of the composition for use according to the invention has an adenine (A) at positions 788 and 802 and a thymine (T) at position 501 from the start codon in the VP4 gene sequence, and a thymine (T) at position 605 and an adenine at position 897 from the start codon in the VP7 sequence.
  • the rotavirus of the composition for use according to the invention comprises a nucleotide sequence encoding a VP4 protein wherein the nucleotide sequence is as shown in Figure 1A (SEQ ID NO:1) or Figure 1B (SEQ ID NO:2), and/or a nucleotide sequence encoding a VP7 protein wherein the nucleotide sequence is as shown in Figure 2A (SEQ ID NO:3) or Figure 2B (SEQ ID NO:4).
  • the rotavirus of the composition for use according to the invention comprises a VP4 protein as set forth is Figure 3 (SEQ ID NO:5), and/or a VP7 protein as set forth is Figure 4 (SEQ ID NO:6).
  • said rotavirus population for use according to the invention additionally comprises an NSP4 protein as set forth in Figure 5 (SEQ ID NO:7), or encoded by the nucleotide sequence as set forth in Figure 6 (SEQ ID NO:8), and/or a VP6 protein as set forth in Figure 7 (SEQ ID NO:9), or encoded by the nucleotide sequence as set forth in Figure 8 (SEQ ID NO:10).
  • Suitable rotavirus populations for use in the present invention may be obtained by a method comprising:
  • the rotavirus population is derived from the P43 (RIX4414), P33 or P26 strains as described above.
  • sequence determination may suitably be carried out by a quantitative or semiquantitative hybridisation technique such as slot blot hybridisation or plaque hybridisation.
  • the resulting cloned virus population resulting from the method according to the invention may be amplified by further passaging on a suitable cell line.
  • Suitable cell types for passaging the rotavirus population in the above method include African green monkey kidney (AGMK) cells, which may be established cell lines or primary AGMK cells.
  • AGMK cell lines include for example Vero (ATCC CCL-81), DBS-FRhL-2 (ATCC CL-160), BSC-1 (ECACC 85011422) and CV-1 (ATCC CCL-70).
  • MA-104 rhesus monkey
  • MRC-5 human -ATCC CCL-171
  • the method is carried out using an appropriate rotavirus, particularly rotavirus having the characteristics of the 89-12 strain or of a passaged derivative thereof.
  • a particularly suitable single variant population is P43, which was obtained from P33 (an isolated human rotavirus passages 33 times in culture on appropriate cell types) by a series of end dilution cloning steps followed by passaging the cloned material on Vero cells for amplification.
  • the disclosure encompasses materials derived from the deposited P43 ECACC 99081301 by subjecting it to further processing such as by propagating it by further passaging, cloning, or other procedures using the live virus or by modifying P43 in any way including by genetic engineering techniques or reassortant techniques. Such steps and techniques are well known in the art.
  • reassortant rotaviruses which comprise at least one antigen or at least one segment of P43, for example reassortants which comprise a virulent strain of rotavirus in which one or part of one of the 11 genome segments has been replaced by the genome segment or part thereof of P43.
  • a rotavirus reassortant in which the segment or partial segment coding for NSP4 is a P43 segment or partial segment may have useful properties.
  • Reassortant rotaviruses and techniques for preparing them are well known ( Foster, R. H. and Wagstaff, A. J. Tetravalent Rotavirus Vaccine, a review. ADIS drug evaluation, BioDrugs, Gev, 9 (2), 155-178, 1998 ).
  • Immunologically active derivatives means materials obtained from or with the P43 virus, particularly antigens of the virus, which are capable of eliciting an immune response that is reactive against Rotavirus when injected into a host animal.
  • ether-sensitive adventitious viruses In the case of ether-sensitive adventitious viruses, this may be done by ether treatment as described hereinbelow.
  • the present disclosure also relates to inclusion of such ether treatment as an optional step in the overall procedure for obtaining an attenuated live rotavirus or vaccine formulated therewith.
  • the cross protective rotavirus strain for use according to the present invention may be combined with other rotavirus strains to provide additional protection or cross-protection against rotavirus infection or disease.
  • the present disclosure also relates to a live attenuated rotavirus vaccine capable of providing cross protection, as defined herein above, admixed with a suitable adjuvant or a pharmaceutical carrier.
  • the rotavirus vaccine for use according to the invention is a monovalent rotavirus vaccine containing a single rotavirus strain such as the G1P[8] strain.
  • the present invention is particularly advantageous in providing a live rotavirus vaccine in which the live attenuated rotavirus is a human rotavirus and does not cause intussusception.
  • Suitable pharmaceutical carriers for use with the attenuated rotavirus strain according to the invention include those known in the art as being suitable for oral administration, especially to infants.
  • Such carriers include and are not limited to carbohydrates, polyalcohols, amino acids, aluminium hydroxide, magnesium hydroxide, hydroxyapatite, talc, titanium oxide, iron hydroxide, magnesium stearate, carboxymethylcellulose, hydroxypropylmethylcellulose, microcrystalline cellulose, gelatin, vegetal peptone, xanthane, caraghenane, arabic gum, ß-cyclodextrin.
  • the disclosure also describes a process for preparing a rotavirus vaccine, for example by freeze drying the virus in the presence of suitable stabilisers or admixing the virus according to the invention with a suitable adjuvant or pharmaceutical carrier.
  • lipid-based vehicles such as virosomes or liposomes
  • immunostimulants such as those known in the art for oral vaccines may be included in the formulation.
  • immunostimulants include bacterial toxins, particularly cholera toxin (CT) in the form of the holotoxin (entire molecule) or the B chain only (CTB) and the heat labile enterotoxin of E. coli (LT).
  • CT cholera toxin
  • LT heat labile enterotoxin of E. coli
  • mLTs Mutated LTs which are less likely to convert to their active form than the native LT are described in WO 96/06627 , WO 93/13202 and US 5,182,109 .
  • saponin derivatives such as QS21 and monophosphoryl lipid A, in particular 3-de-O-acylated monophosphoryl lipid A (3D-MPL).
  • Purified saponins as oral adjuvants are described in WO 98/56415 .
  • Saponins and monophosphoryl lipid A may be employed separately or in combination (e.g. WO 94/00153 ) and may be formulated in adjuvant systems together with other agents.
  • 3D-MPL is a well-known adjuvant manufactured by Ribi Immunochem, Montana and its manufacture is described in GB 2122204 .
  • the disclosure also relates to a method for vaccinating human subjects, especially infants, by administering to a subject in need thereof an effective amount of a vaccine composition according to the invention.
  • a vaccine composition according to the invention.
  • the live attenuated vaccine is administered by oral administration.
  • the attenuated rotavirus strain for use according to the invention is formulated with an antacid to minimise inactivation of the vaccine by acid in the stomach.
  • Suitable antacid components include inorganic antacids for example aluminium hydroxide Al(OH) 3 and magnesium hydroxide Mg(OH) 2 .
  • Commercially available antacids which are suitable for use in the invention include Mylanta (trade mark) which contains aluminium hydroxide and magnesium hydroxide. These are insoluble in water and are given in suspension.
  • Aluminium hydroxide is a particularly suitable component of a vaccine composition for use according to the invention as it can provide not only an antacid effect but also an adjuvantation effect.
  • organic antacids such as organic acid carboxylate salts.
  • a suitable antacid in the vaccine composition for use according to of the invention contains an organic acid carboxylate salt, specifically a salt of citric acid such as sodium citrate or potassium citrate.
  • a particularly suitable antacid that may be used in the vaccine composition for use according to the present invention is the insoluble inorganic salt, calcium carbonate (CaCO 3 ).
  • the calcium carbonate is able to associate with the rotavirus and the rotavirus activity is maintained during the association with the calcium carbonate.
  • viscous agents are suitably present in the formulation.
  • pseudoplastic excipients Possible viscous agents that may be used include pseudoplastic excipients.
  • a pseudoplastic solution is defined as a solution having higher viscosity on standing compared to its viscosity under agitation.
  • Excipients of this type are natural polymers such as arabic gum, adragante gum, agar-agar, alginates, pectines or semi-synthetic polymers for example: carboxymethylcellulose (Tyloses C®), methylcellulose (Methocels A®, Viscotrans MC®, Tylose MH® and MB®), hydroxypropylcellulose (Klucels®), and hydroxypropylmethylcellulose (Methocels E® and K®, Viscontrans MPHC®).
  • pseudoplastic excipients are used together with thixotropic agents.
  • Alternative viscous agents that may be used are pseudoplastic excipients with low flowing capacity. Those polymers, at a sufficient concentration, give rise to a structural fluid arrangement resulting in a high viscosity solution having low flowing capacity on standing. A certain quantity of energy needs to be given to the system to allow flowing and transfer.
  • Examples of such polymers are Carbopols® and xanthane gum.
  • Thixotropic excipents become a gel structure on standing whilst under agitation they form a fluid solution.
  • thixotropic excipients are: Veegum ®(Magnesium-aluminium silicate) and Avicel RC® (about 89% microcrystalline cellulose and 11% Carboxymethylcellulose Na).
  • the vaccine composition for use according to the present invention suitably comprises a viscous agent selected from xanthane gum or starch.
  • the vaccine composition for use according to the present invention is typically formulated with a combination of calcium carbonate and xanthane gum.
  • compositions used in the invention suitably include sugars for example sucrose and/or lactose.
  • the vaccine composition for use according to the invention may contain additional components including for example flavourings (particularly for an oral vaccine) and bacteriostatic agents.
  • the disclosure relates to a vaccine administered as a liquid formulation.
  • the liquid formulation is reconstituted prior to administration from at least the following two components:
  • the virus component and the liquid component are normally present in separate containers, which may conveniently be separate compartments of a single vessel, or separate vessels which can be connected in such a way that the final vaccine composition is reconstituted without exposing it to the air.
  • the virus Prior to reconstitution, the virus may be in a dry form or a liquid form.
  • the virus component is lyophilised. Lyophilised virus is more stable than virus in an aqueous solution.
  • the lyophilised virus may be suitably reconstituted using a liquid antacid composition to produce a liquid vaccine formulation.
  • the lyophilised virus may be reconstituted with water or aqueous solution, in which case the lyophilised virus composition suitably contains an antacid component.
  • the vaccine formulation comprises a virus component formulated with calcium carbonate and xanthane gum in one compartment or vessel and this is reconstituted with water or aqueous solution present in the second compartment or vessel.
  • the vaccine composition as disclosed therein is a solid formulation, suitably a lyophilised cake which is suitable for immediate dissolution when placed in the mouth.
  • Lyophilised formulations may conveniently be provided in the form of tablets in a pharmaceutical blister pack.
  • the disclosure describes a rotavirus vaccine in the form of a quick dissolving tablet for oral administration.
  • the disclosure describes a composition
  • a composition comprising a live attenuated rotavirus strain, in particular a human rotavirus strain, wherein the composition is a lyophilised solid capable of immediate dissolution when placed in the mouth.
  • the quick dissolving tablet according to the invention dissolves in the mouth of the subject sufficiently quickly to prevent swallowing of the undissolved tablet.
  • This approach is particularly advantageous for paediatric rotavirus vaccines.
  • the virus is a live attenuated human rotavirus which is formulated with an inorganic antacid such as calcium carbonate and a viscous agent such as xanthane gum.
  • an inorganic antacid such as calcium carbonate
  • a viscous agent such as xanthane gum.
  • Vaccines for use according to the invention may be formulated and administered by known techniques, using a suitable amount of live virus to provide effective protection against rotavirus infection without significant adverse side effects in typical vaccinees.
  • a suitable amount of live virus will normally be between 10 4 and 10 7 focus forming units (ffu) per dose.
  • a typical dose of vaccine may comprise 10 5 - 10 6 ffu per dose and may be given in several doses over a period of time, for example in two doses given with a two-month interval. Benefits may however be obtained by having more than 2 doses, for example a 3 or 4 dose regimen, particularly in developing countries. The interval between doses may be more or less than two months long.
  • An optimal amount of live virus for a single dose or for a multiple dose regimen, and optimal timing for the doses can be ascertained by standard studies involving observation of antibody titres and other responses in subjects,
  • the vaccine for use according to the invention may also comprise other suitable live viruses for protection against other diseases, for example poliovirus.
  • suitable live virus vaccines for oral administration may be given in a separate dose but on the same occasion as the rotavirus vaccine composition according to the invention.
  • Immunogenic fragments may be defined in the context of this invention as fragments that when administered at an effective dose (either alone or as a hapten bound to a carrier) elicit a protective immune response against rotavirus infection.
  • RNA extraction was reverse transcribed and amplified through PCR in one tube/one step.
  • the passage P26 sequence differed from the passage P33 sequence by 3 bases (at positions 501, 788 and 802 bp from the start codon) in VP4 and by three bases in VP7 (108, 605 and 897 bp from the start codon).
  • passage P26 sequence scans of VP4 and VP7 show at mutated positions the presence of the passage P33 sequence as a background.
  • passage P26 is a mixture of at least 2 variants.
  • the bases shown in bold type in Table 2 are the sites of specific sequence variation in VP4 and VP7.
  • the VP7 897 bp position nucleotide is G, rather than A as in the P43 selected clone. This results in a methionine in place of an isoleucine in the amino acid sequence. Variants corresponding to both the selected P43 clone and the clone in which there is a G in VP7 at 897 bp from the start codon, were excreted in the stools of infants who had been vaccinated with the P33 material.
  • Table 3.2 shows the amino acid changes resulting from the nucleotide differences between the variants.
  • Positive wells were selected using two criteria: growth demonstrated by the largest number of foci detected in the wells and the most isolated positive wells on the plates, as is done classically. After 3 end dilution passages in 96 well microtiter plates, 10 positive wells were amplified successively on Vero cells and evaluated for their yield.
  • the selected clone was amplified by successive passages on Vero cells to generate a Master seed, a Working seed and finally production lots.
  • the selected clone was genetically characterized at different passage levels by sequencing of VP4 and VP7 (identity) and by specific slot blot hybridization of the VP4 and VP7 (homogeneity) of the PCR amplified materials.
  • the sequence of the VP4 and VP7 genes of the P43 material are given in Figures 1 and 2 respectively and are identical to P41.
  • Homogeneity of the selected clone was assessed by a selective hybridization using oligonucleotide probes discriminating nucleotide changes in VP4 and/or VP7 regions for each variant identified during sequencing of P26/primary AGMK (see Table 4).
  • the VP4 fragment hybridized with Rota 16 and not with Rota 15, Rota 35 or Rota 36.
  • the VP7 fragment hybridized with Rota 41 and not with Rota 42.
  • Ether was added to P33 (AGMK grown) to a final concentration of 20% for 1 hr. Ether was then bubbled out with N 2 for 35 min. No impact on the titre of P33 seed was observed.
  • EXAMPLE 4 Formulation of a live attenuated vaccine
  • the production lots described above are formulated for oral adminstration to infants by the following method.
  • Standard techniques are used for preparing virus doses. Frozen purified viral bulk is thawed and diluted with appropriate medium composition, in this case Dulbecco's modified eagle Medium, up to a desired standard viral concentration, in this case 10 6.2 ffu/ml. The diluted virus is then further diluted with lyophilisation stabiliser (sucrose 4%, dextran 8%, sorbitol 6%, amino-acid 4%) up to the target viral titre, in this case 10 5.6 ffu/dose. 0.5 ml aliquots of stabilised virus composition are aseptically transferred to 3 ml vials. Each vial is then partially closed with a rubber stopper, the sample is freeze dried under a vacuum, the vial is then fully closed and an aluminium cap is crimped in place around the vial to keep the stopper in place.
  • appropriate medium composition in this case Dulbecco's modified eagle Medium
  • lyophilisation stabiliser sucrose 4%, dex
  • the virus is reconstituted using one of the following antacid reconstituents:
  • Sodium citrate is dissolved in water, sterilized by filtration and aseptically transferred into reconstituent containers in 1.5 ml amounts at a concentration of 544 mg Na 3 Citrate.2H 2 O per 1.5ml dose.
  • the reconstituent containers may be for example 3 ml vials, or 4 ml vials, or 2 ml syringes, or soft plastic squeezable capsules for oral administration.
  • the final container can be autoclaved.
  • An aseptic aluminium hydroxide suspension (Mylanta - trademark) is aseptically diluted in sterile water, aseptically transferred to reconstituent containers (for example 2 ml syringes, or soft plastic squeezable capsules) in 2 ml amounts each containing 48 mg Al(OH) 3 .
  • An alternative to using sterile components under sterile conditions is to y irradiate the aluminium hydroxide suspension (preferably at a diluted stage).
  • Standard ingredients are included to prevent the suspension from settling.
  • Such standard ingredients include for example magnesium stearate, carboxymethylcellulose, hydroxypropylmethylcellulose, microcrystalline cellulose, and silicone polymers.
  • Bacteriostatic agents for example butylparaben, propylparaben or other standard bacteriostatic agents used in food, and flavourings, may also be included.
  • Standard techniques are used for preparing virus doses. Frozen purified viral bulk is thawed and diluted with appropriate medium composition, in this case Dulbecco's modified eagle Medium, up to a desired standard viral concentration, in this case 10 6.2 ffu/ml. Aluminium hydroxide suspension is added to reach a final quantity of 48 mg/dose and the virus composition is diluted with lyophilisation stabiliser (sucrose 4%, dextran 8%, sorbitol 6%, amino-acid 4%) up to the target viral titre, in this case 10 5.6 ffu/dose. 0.5 ml aliquots of stabilised virus composition are aseptically transferred to 3 ml vials. Lyophilisation and closing of the vials is then carried out as described in part 1.
  • appropriate medium composition in this case Dulbecco's modified eagle Medium
  • Aluminium hydroxide suspension is added to reach a final quantity of 48 mg/dose and the virus composition is diluted with lyophilisation stabiliser
  • Standard techniques are used for preparing virus doses.
  • Frozen purified viral bulk is thawed and diluted with appropriate medium composition, in this case Dulbecco's modified eagle Medium, up to a desired standard viral concentration, in this case 10 6.2 ffu/ml.
  • Aluminium hydroxide suspension is added to reach a final quantity of 48 mg/dose and the virus composition is diluted with lyophilisation stabiliser which may be sucrose, dextran or amino-acid 4%, or gelatin, or vegetal peptone, or xanthane up to the target viral titre of 10 5.6 ffu/dose.
  • An aseptic filling operation is employed to transfer doses of 0.5 ml or preferably less to blister cavities.
  • the composition is lyophilised, and the blister cavities are sealed by thermic sealing.
  • Standard ingredients are included to prevent the aluminium hydroxide suspension from settling.
  • standard ingredients include for example magnesium stearate, carboxymethylcellulose, hydroxypropylmethylcellulose, microcrystalline cellulose, and silicone polymers.
  • Flavourings may also be included.
  • P43 rotavirus was formulated either with sucrose or with lactose as shown in the table above.
  • Viral titration before lyophilisation is the viral titre in the completed formulated liquid (containing sucrose dextran sorbitol aminoacids) and without the lyophilisation step.
  • Good results are those in which a ⁇ 0.5 log decrease at the lyophilisation step and ⁇ 0.5 log decrease during the "1 week at 37°C" (accelerated stability test) are achieved.
  • the precision of the viral titration is around + or - 0.2 log.
  • sucrose may be used instead of lactose.
  • Sorbitol tends to decrease the glass transition temperature of the lyophilised cake by too great a degree. This can be overcome by using maltitol instead of sorbitol as shown above and the viral titer is still maintained.
  • Al(OH) 3 is used as an antacid. This shows that Rotavirus is associated with the insoluble inorganic salt (Al(OH) 3 ) since it centrifuged together with the Al(OH) 3 (decrease of viral activity in the supernatant).
  • Rotavirus When Rotavirus is associated with the Al(OH) 3 , it is possible to lyophilise everything (including the Al(OH) 3 ). After lyophilisation, it is possible to recover the Rotavirus by dissolving Al(OH) 3 in SodiumCitrate. This step does not damage the Rotavirus and retains its activity after this dissolution step.
  • Rotavirus may be liberated from the Rotavirus - Al(OH) 3 association and the liberated Rotavirus remains active.
  • This liberation can be done either by dissolving Al(OH) 3 (by HCl in the stomach, or by Na 3 Citrate in vitro) or by displacing Rotavirus by a basic amino acid (lysine).
  • a single dose of lyophilised Rotavirus was reconstituted with water and divided into two parts.
  • the first part considered as the reference, received an additional volume of water.
  • the second part received 24mg of Al(OH) 3 suspended in 0.240 ml of water (Preclinical viral titrations).
  • the reference sample was the one reconstituted with a Citrate-Bicarbonate buffer.
  • the viral titer is again higher in the presence of Al(OH) 3 .
  • DRVC003A46 + 1.5 ml WL buffer DRVC003A46 + 12 mg Al(OH)3 in 0.120ml + 1.380ml H2O
  • Rotavirus associates with the Al(OH) 3 particles, since the virus can be discarded by centrifugation.
  • DRVC003A46 is a lyophilised formulated Rotavirus (Sucrose:2%; Dextran: 4%,Sorbitol:3%; Amino-acids:2%).
  • SDSAA Sucrose 2%, Dextran 4%, Sorbitol 3%, Amino-Acid 2%.
  • the antacid Al(OH) 3 was replaced by another insoluble inorganic salt: CaCO 3 (calcium carbonate).
  • lyophilised Rotavirus (viral titer 5.7) was reconstituted with a suspension of CaCO 3 in water (50mg in 1.5ml); and then centrifuged, and the viral titer of the supernatant compared to the pellet.
  • viral titers are slightly higher that those obtained without CaCO 3 .
  • a pseudoplastic solution is defined as a solution having higher viscosity on standing compared to its viscosity under agitation.
  • Examples of such polymers are Carbopols® and Xanthane gum.
  • thixotropic excipients examples include: Veegum ®(Magnesium-aluminium silicate) and Avicel RC® (about 89% microcrystalline cellulose and 11 % Caboxymethylcellulose Na).
  • a reduction in the CaCO 3 particle size resulted in a decrease in the antacid capacity of the compound.
  • the antacid can be placed in the reconstituent liquid contained in the syringe.
  • sedimentation of CaCO 3 must be under control not only during the filling steps, but also during the complete shelf-live of the product (at least 2 years).
  • Rotavirus, CaCO 3 and Xanthane gum are lyophilised together directly in the blister.
  • strains DS-1, P and VA70 are described as Human rotavirus reference strains for serotype G2, G3 and G4 respectively at page 1361 of "Fields" Raven press 1990, second editi on.
  • EXAMPLE 9 Phase I safety study in adults of one oral administration of the Rotavirus vaccine.
  • Vials of placebo were prepared and released. Each vial of placebo contained the following components: Excipients, stabilizers: Sucrose 9 mg Dextran 18 mg Sorbitol 13.5 mg Amino acids 9 mg
  • Water for injection was used as diluent to reconstitute vaccine and placebo.
  • Mylanta® is a registered antacid.
  • the antacid increases the pH of the stomach and prevents inactivation of the rotavirus during its passage through the stomach.
  • placebo two vials of lyophilized placebo were reconstituted with 1.5 ml water for injection and administered orally as a single dose.
  • Diarrhea samples were to be collected during eight days post administration.
  • SB Biologicals P43 vaccine was safe relative to the placebo when administered orally in a double-blind fashion as a single dose at the dose of 10 6.1 ffu to healthy adult volunteers aged 18 to 44.
  • RIX4414 human rotavirus strain derived from the G1P[8] human strain 89-12 for infant immunisation.
  • RIX4414 vaccine comprises as rotavirus component the attenuated G1P[8] human strain deposited as ECACC deposit 99081301 ( WO 01/12797 ).
  • the HRV vaccine or placebo was prepared for administration by injecting the entire content of one pre-filled syringe containing the calcium carbonate buffer into the vial of the lyophilized product (vaccine or placebo). The vial was shaken to resuspend the vaccine/placebo. The entire volume of the resuspended product was withdrawn into the same syringe, the needle discarded and the resuspended product administered promptly as a single oral dose (approximately 1.0 ml).
  • Table 17 - RIX4414 rotavirus vaccine composition Ingredients Quantity (per nominal dose: 1 ml) Active ingredient RIX4414 10 5.8 ffu/dose Excipients Lyophilized vaccine in glass vial Sucrose 9 mg Dextran 18 mg Sorbitol 13.5 mg Amino acids 9 mg Dulbecco's Modified 2.25 mg Eagle Medium (DMEM) Liquid diluent (CaCO -3 -based) in pre-filled syringe Calcium carbonate 60 mg Xanthan 2.5 mg Water for Injections q. s. ad 1 ml
  • Healthy infants received two doses of the RIX4414-rotavirus vaccine at a viral concentration of 10 5.8 ffu per dose, or placebo (504) at age 2 and 4 months, concomitantly with DTPw-HBV and Hib vaccines.
  • Three doses of OPV (oral polio virus vaccine) were given 2 weeks apart from study vaccine, i.e. were not to be administered during the period starting 2 weeks before each dose of study vaccine and ending 2 weeks after.
  • Two other groups received 2 doses of the RIX4414-rotavirus vaccine at different viral concentrations: 10 4.7 ffu and 10 5.2 ffu.
  • Diarrhoeal samples were tested for the presence of rotavirus (ELISA) and the serotypes determined in positive samples (RT-PCR). Diarrhoeal episodes reported from two weeks after the second dose were considered for the efficacy analysis. Severity was determined using a 20-point scale (Ruuska and Vesikari, 1990). The 20-point scoring system used to assess the severity of each diarrhoea episode in this study is shown below in Table 18. A score ⁇ 11 defined severe disease.
  • Table 18 Adverse Experience Points Duration of looser than normal stools (days) 1-4 1 5 2 ⁇ 6 3 Maximum number of looser than normal stools/24 hours 1-3 1 4-5 2 ⁇ 6 3 Duration of vomiting (days) 1 1 2 2 ⁇ 3 3 Maximum number of episodes of vomiting/24 hours 1 1 2-4 2 ⁇ 5 3 Fever (measured rectally/axillary)* 37.1-38.4°C/36.6-37.9°C 1 38.5-38.9°C/38.0-38.4°C 2 ⁇ 39°C/ ⁇ 38.5°C 3 Treatment Rehydration 1 Hospitalization 2 Dehydration 1-5 % 2 ⁇ 6% 3 * The highest temperature recorded during the episode was scored.
  • a randomised, double-blind, placebo-controlled phase II trial was conducted in Latin America to evaluate the protective efficacy and efficacy against hospitalization of a vaccine derived from the G1P[8] human strain 89-12 for infant immunisation.
  • the vaccine used was named RIX4414 rotavirus vaccine, and comprises as the rotavirus component the attenuated G1 human strain deposited as ECACC deposit 99081301.
  • the cohort for efficacy analysis consisted of 1846 subjects (468 subjects in the 10 4.7 ffu HRV vaccine group, 460 subjects in the 10 5.2 ffu HRV vaccine group, 464 subjects in the 10 5.8 ffu HRV vaccine group and 454 subjects in the placebo group at age 2 and 4 months, concomitantly with DTPw-HBV and Hib vaccines.
  • Diarrhoeal samples were tested for the presence of rotavirus (ELISA) and the serotypes determined in positive samples (RT-PCR). Diarrhoeal episodes reported from two weeks after the second dose until subjects were one year of age were considered for the efficacy analysis. Severity was determined using a 20-point scale (Ruuska and Vesikari, 1990). A score ⁇ 11 defined severe disease (see Example 10 for the description of the 20-point scoring system).
  • Table 19 Features of rotavirus gastro-enteritis episodes reported during the study RIX4414 10 4.7 ffu RIX4414 10 5.2 ffu RIX4414 10 5.8 ffu Placebo Any rotavirus gastroenteritis 21 22 15 51 no.
  • RIX 4414 rotavirus vaccine comprises as the rotavirus component the attenuated G1 human strain deposited as ECACC deposit 99081301.
  • Example 12 Part of the results of Example 12 is already presented in Examples 10 and 11. Data were pooled from Phase II studies, one in Finland and one in Latin America (Brazil, Mexico and Venezuela) (Examples 10 and 11) and from one Phase III study in 11 Latin American countries (Example 13) using the same methodology and efficacy criteria. In total, 20081 healthy infants (cohort for efficacy) vaccinated with 2 doses of RIX 4414 vaccine or placebo at 2 and 4 months of age were followed until one year of age for severe gastroenteritis (GE) with a score on the Vesikari ( Ruuska T et al. Scand. J. Infect. Dis. 1990, 22, 259-267 ) severity scale ⁇ 11. GE samples were tested for rotavirus (by ELISA) and typed by RT-PCR.
  • GE severe gastroenteritis
  • RIX 4414 vaccine is also highly protective against other strains which have either a different G type (eg G3, G9), a different P type (eg P[4]), or both different G type and P type, as illustrated by the efficacy against G2P[4].
  • Example 15 As more data became available from Singapore and from a European study (Example 15), an additional meta analysis was carried out to include these studies in addition to studies mentioned in Example 12.
  • VE and its 95%Cl was estimated as 1-rate of RVGE relative to placebo using exact Poisson rate ratio stratified by study (Proc StatXact4 for SAS Users, 1999, cytel software corporation, exact Confidence Interval for common relative risk, p298)
  • Table 23 Number of subjects reporting any or severe RV GE episodes caused by G2P[4] RV type and percentage of vaccine efficacy during the first efficacy period - (meta analysis), cohort for efficacy
  • the clinical case definition for capture of severe gastroenteritis episode was an episode of diarrhea (passage of three or more looser than normal or watery stools within 24 hours) with or without vomiting that required overnight hospitalization and/or rehydration therapy equivalent to WHO plan B (oral rehydration therapy) or WHO plan C (intravenous rehydration therapy) in a medical facility such as hospital, clinic or supervised rural health care center (hftr)://www.who.int/child-adolescent-health/New_Publications/ CHILDHEALTH/textrev4.htm).
  • Disease severity was graded using the 20-point Vesikari scale; severe RVGE was defined as a score ⁇ 11.
  • Vesikari's score was modified: Since the dehydration was not recorded in the eCRF, the following rule was applied: a subject that had a severe GE episode was considered as being dehydrated between 1 to 5% if this subject received oral re-hydration. A subject was considered as being dehydrated ⁇ 6 % if the subject was hospitalized and/or received intravenous (IV) re-hydration.
  • IV intravenous
  • the cohort for efficacy consisted of 9009 subjects vaccinated with HRV vaccine and 8858 subjects receiving a placebo recipient. There were 12 children with severe rotavirus gastroenteritis according to the clinical definition in the vaccine and 77 in the placebo group (2.0 vs. 13.3 children with ⁇ 1 episode per 1,000 child-years, respectively; p ⁇ 0.001, two-sided Fisher's exact test), resulting in a vaccine efficacy of 84.7% against severe rotavirus gastroenteritis from 15 days post-dose 2 until one year of age (shown in Table 24). Similar results were obtained with the total vaccinated cohort (vaccine efficacy of 81.1%; 95 % C.I.
  • n number of infants reporting at least one specified episode
  • Cl confidence interval
  • WHO plan B oral rehydration therapy
  • WHO plan C intravenous rehydration therapy
  • G1P[8] and G9P[8] were isolated from one infant a G1P[8] type alone was isolated from 2 infants; G1P[8] and G9P[8] were isolated from one infant b ; G1P[8] type alone was isolated from 34 infants; G1P[8] and G9P[8] were isolated from one infant; G1, G2, G9 types were isolated from one infant c G3P[8] type alone was isolated from one infant, G4P[8] type alone from 1 infant; and G9P[8] alone from one infant; G1P[8] and G9P[8] were isolated from one infant d G3P[8] type alone was isolated from 8 infants, G4P[8] type alone from 2 infants; and G9P[8] alone from 19 infants; G1P[8] and G9P[8] were isolated from 1 infant; and G1P[8] and G2P[4 and G9P
  • Type specific vaccine efficacy against wild-type strains is shown in Table 24.
  • Vaccine efficacy against strains sharing the P[8] antigen (G3P[8], G4P[8] and G9P[8]) was 86.9% (P ⁇ 0.001, two-sided Fisher's exact test).
  • Efficacy against G1P[8] and strains sharing only the P[8] epitope with HRV was 92% (95%C.I. 74,98) and 87% (95%C.I. 64,97) respectively (P ⁇ 0.001, two-sided Fisher's exact test). Hospitalization for diarrhea of all cause was reduced by 42% (95%C.I. 29,53; P ⁇ 0.001, two-sided Fisher's exact test).
  • Vaccine composition (Table 25) Vaccine Formulation
  • the HRV vaccine was highly effective in protecting against RV GE during the first efficacy period.
  • Vaccine efficacy was 87.1% (95% CI: 79.6%; 92.1%) against any episodes of RV GE and 95.8% (95% CI: 89.6%; 98.7%) against severe RV GE episodes.
  • vaccine efficacy was increasingly higher, reaching 100% in a population having RV GE with a Vesikari score ⁇ 17 points.
  • Vaccine efficacy against hospitalization for RV GE was 100% (95% CI: 81.8%; 100%) and against RV GE episodes requiring medical attention was 91.8% (95% CI: 84.0%; 96.3%) (Tables 26 and 27).
  • Table 26 Percentage of subjects reporting any and severe RV GE, percentage of subjects hospitalized due to RV GE episodes, and vaccine efficacy during first efficacy period - cohort for efficacy Groups Any RV GE Severe RV GE (score ⁇ 11 on Vesikari scale) Subjects Vaccine efficacy Subjects Vaccine efficacy Subjects Vaccine efficacy N n % P-value % VE 95%Cl n % P-value % VE 95%Cl 10 6.5 CCID 50 2572 24 0.9 ⁇ 0.001 87.1 79.6-92.1 5 0.2 ⁇ 0.001 95.8 89.6-98.7 Placebo 1302 94 7.2 - - - 60 4.6 - - - Hospitalized RV GE Subjects Vaccine efficacy N n % P-value % VE 95%Cl Study 10 6.5 CCID 50 2572 0 0.0 ⁇ 0.001 100 81.8-100 Placebo 1302 12 0.9 -
  • the HRV vaccine was highly protective against any and severe RV GE caused by G1P[8], G3P[8], G4P[8] and G9P[8] strains (Table 28).
  • the RIX4414 rotavirus vaccine proved to be highly protective against rotavirus gastroenteritis episodes measured by a clinical definition for case capture focusing on hospitalization and re-hydration, as well as by the validated Vesikari scale which includes quantifiable morbidity outcomes related with diarrhea, vomiting, fever, dehydration and hospitalization.
  • Two oral doses of HRV vaccine were highly efficacious in protecting infants against any and severe RVGE and hospitalization due to multiple circulating rotavirus strains.

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Claims (17)

  1. Utilisation d'une souche atténuée de rotavirus d'un type G1P[8] dans la fabrication d'une composition destinée à conférer une protection contre une infection à rotavirus provoquée par une souche de rotavirus d'un type G2P[4].
  2. Utilisation selon la revendication 1, dans laquelle la composition comprend un rotavirus possédant un gène VP4 comprenant, dans la séquence nucléotidique, au moins l'une des suivantes : une base adénine (A) au niveau de la position 788, une base adénine (A) au niveau de la position 802 et une base thymine (T) au niveau de la position 501 à partir du codon de départ.
  3. Utilisation selon la revendication 2, dans laquelle le gène VP4 comprend une séquence nucléotidique comprenant une base adénine (A) au niveau des positions 788 et 802 et une base thymine (T) au niveau de la position 501 à partir du codon de départ.
  4. Utilisation selon l'une quelconque des revendications 1 à 3, dans laquelle la composition comprend un rotavirus possédant un gène VP7 comprenant, dans la séquence nucléotidique, au moins l'une des suivantes : une thymine (T) au niveau de la position 605, une adénine (A) au niveau de la position 897 et une guanine (G) au niveau de la position 897 à partir du codon de départ.
  5. Utilisation selon la revendication 4, dans laquelle le gène VP7 comprend une séquence nucléotidique comprenant une thymine (T) au niveau de la position 605 et une adénine (A) ou une guanine (G) au niveau de la position 897 à partir du codon de départ.
  6. Utilisation selon l'une quelconque des revendications 1 à 5, dans laquelle la composition comprend un rotavirus possédant un gène VP4 comprenant, dans la séquence nucléotidique, une adénine (A) au niveau des positions 788 et 802 et une thymine (T) au niveau de la position 501 à partir du codon de départ ; et où le gène VP7 comprend, dans la séquence nucléotidique, une thymine (T) au niveau de la position 605 et une adénine (A) au niveau de la position 897 à partir du codon de départ.
  7. Utilisation selon l'une quelconque des revendications 1 à 6, dans laquelle la composition confère en outre une protection contre au moins l'un des sérotypes non G1 choisis dans le groupe constitué de : G3, G4 et G9.
  8. Utilisation selon l'une quelconque des revendications précédentes, dans laquelle la composition comprenant une souche atténuée de rotavirus d'un type G1P[8] fournit une protection contre une gastroentérite sévère induite par un rotavirus présentant un score égal ou supérieur à 11 sur l'échelle de Vesikari provoquée par une infection d'une souche de rotavirus d'un type G2P[4].
  9. Utilisation selon l'une quelconque des revendications 1 à 8, dans laquelle la composition comprenant une souche atténuée de rotavirus d'un type GlP[8] est au moins protectrice à 40 %, dans une population d'individus vaccinés, contre la diarrhée provoquée par une souche de rotavirus qui est d'un type G2P[4].
  10. Utilisation selon la revendication 9, dans laquelle la composition est au moins protectrice à 50 %.
  11. Utilisation selon la revendication 9, dans laquelle la composition est protectrice entre 40 % et 80 %.
  12. Utilisation selon la revendication 11, dans laquelle la composition est protectrice entre 50 % et 70 %.
  13. Utilisation selon la revendication 8, dans laquelle la composition est protectrice entre 40 % et 75 % dans une population d'individus vaccinés contre une gastroentérite sévère présentant un score égal ou supérieur à 11 sur l'échelle de Vesikari provoquée par une infection de rotavirus avec un sérotype G2P[4].
  14. Utilisation selon l'une quelconque des revendications 1 à 13, dans laquelle la souche de rotavirus dans ladite composition est le dépôt 99081301 de l'ECACC, ou peut être obtenue ou dérivée du dépôt 99081301 de l'ECACC.
  15. Utilisation selon l'une quelconque des revendications 1 à 14, dans laquelle la composition est administrée dans un régime de 2 doses.
  16. Utilisation selon l'une quelconque des revendications 1 à 15, dans laquelle la souche atténuée de rotavirus est formulée avec un support pharmaceutique approprié ou avec un tampon antiacide ou les deux.
  17. Utilisation selon l'une quelconque des revendications 1 à 16, dans laquelle la composition est destinée à conférer une protection chez un sujet humain.
EP10159949.6A 2005-08-17 2006-08-15 Vaccin anti-rotavirus inducteur de protection croisée hétérotipique Active EP2233153B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL10159949T PL2233153T3 (pl) 2005-08-17 2006-08-15 Szczepionka rotawirusowa wywołująca heterotypową ochronę krzyżową
SI200631912T SI2233153T1 (sl) 2005-08-17 2006-08-15 Rotavirusno cepivo, ki inducira heterotipično navzkrižno zaščito
HRP20150310TT HRP20150310T1 (hr) 2005-08-17 2015-03-18 Cjepivo protiv rotavirusa koje inducira heterotipnu ukriženu zaštitu
CY20151100289T CY1116135T1 (el) 2005-08-17 2015-03-23 Εμβολιο ροταϊου που διεγειρει ετεροτυπικη εγκαρσια προστασια

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0516944A GB0516944D0 (en) 2005-08-17 2005-08-17 Vaccine
GB0521164A GB0521164D0 (en) 2005-10-18 2005-10-18 Vaccine
GB0608962A GB0608962D0 (en) 2006-05-05 2006-05-05 Vaccine
EP06776899A EP1915173A2 (fr) 2005-08-17 2006-08-15 Vaccin anti-rotavirus inducteur de protection croisee heterotipique

Related Parent Applications (4)

Application Number Title Priority Date Filing Date
PCT/EP2006/008094 Previously-Filed-Application WO2007020078A2 (fr) 2005-08-17 2006-08-15 Vaccin
WOPCT/EP2006/008094 Previously-Filed-Application 2006-08-15
EP06776899A Division EP1915173A2 (fr) 2005-08-17 2006-08-15 Vaccin anti-rotavirus inducteur de protection croisee heterotipique
EP06776899.4 Division 2006-08-15

Publications (2)

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EP2233153A1 EP2233153A1 (fr) 2010-09-29
EP2233153B1 true EP2233153B1 (fr) 2015-01-21

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EP10159949.6A Active EP2233153B1 (fr) 2005-08-17 2006-08-15 Vaccin anti-rotavirus inducteur de protection croisée hétérotipique
EP06776899A Ceased EP1915173A2 (fr) 2005-08-17 2006-08-15 Vaccin anti-rotavirus inducteur de protection croisee heterotipique

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EP06776899A Ceased EP1915173A2 (fr) 2005-08-17 2006-08-15 Vaccin anti-rotavirus inducteur de protection croisee heterotipique

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US (1) US20090028828A1 (fr)
EP (2) EP2233153B1 (fr)
JP (1) JP5519934B2 (fr)
KR (1) KR20080036648A (fr)
AR (1) AR054916A1 (fr)
AU (1) AU2006281566B2 (fr)
BR (1) BRPI0615203A2 (fr)
CA (1) CA2619751C (fr)
CR (1) CR9759A (fr)
CY (1) CY1116135T1 (fr)
DK (1) DK2233153T3 (fr)
EA (1) EA014328B1 (fr)
ES (1) ES2534637T3 (fr)
HR (1) HRP20150310T1 (fr)
IL (1) IL189289A0 (fr)
MA (1) MA29700B1 (fr)
MX (1) MX2008002270A (fr)
NO (1) NO20080754L (fr)
PE (1) PE20070235A1 (fr)
PL (1) PL2233153T3 (fr)
PT (1) PT2233153E (fr)
SG (1) SG163571A1 (fr)
SI (1) SI2233153T1 (fr)
TW (1) TW200740457A (fr)
WO (1) WO2007020078A2 (fr)

Families Citing this family (6)

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GB0107510D0 (en) 2001-03-26 2001-05-16 Univ Bristol New elongase gene and a process for the production of -9-polyunsaturated fatty acids
EP2197283B1 (fr) * 2007-09-25 2013-07-17 Aridis Pharmaceuticals Formulations pour la préservation de rotavirus
US9311112B2 (en) * 2009-03-16 2016-04-12 Apple Inc. Event recognition
EP2701735A4 (fr) * 2011-04-28 2014-11-26 Internat Medica Foundation Préparations de vaccins liquides
CN104507495A (zh) * 2012-04-23 2015-04-08 巴拉特生物技术国际有限公司 轮状病毒疫苗组合物及其制备方法
WO2017062246A1 (fr) 2015-10-05 2017-04-13 The United States Of America, As Represented By The Secretary, Department Of Health & Human Services Souche de rotavirus humain g9p[6] et utilisation comme vaccin

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0557427B1 (fr) * 1990-11-16 1998-08-26 Children's Hospital Medical Center Rotavirus humains, vaccins et procedes
HU228975B1 (en) * 1999-08-17 2013-07-29 Smithkline Beecham Biolog Vaccine
PL1660123T3 (pl) * 2003-09-02 2013-08-30 Glaxosmithkline Biologicals Sa Szczepionka rotawirusowa

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PT2233153E (pt) 2015-04-20
KR20080036648A (ko) 2008-04-28
SG163571A1 (en) 2010-08-30
JP5519934B2 (ja) 2014-06-11
BRPI0615203A2 (pt) 2011-05-10
MX2008002270A (es) 2008-03-27
EP2233153A1 (fr) 2010-09-29
TW200740457A (en) 2007-11-01
SI2233153T1 (sl) 2015-05-29
WO2007020078A3 (fr) 2007-05-24
CY1116135T1 (el) 2017-02-08
PE20070235A1 (es) 2007-04-04
AU2006281566B2 (en) 2011-09-01
AR054916A1 (es) 2007-07-25
WO2007020078A2 (fr) 2007-02-22
CR9759A (es) 2008-05-05
EA014328B1 (ru) 2010-10-29
ES2534637T3 (es) 2015-04-27
EA200800320A1 (ru) 2008-10-30
PL2233153T3 (pl) 2015-06-30
HRP20150310T1 (hr) 2015-06-19
MA29700B1 (fr) 2008-08-01
IL189289A0 (en) 2008-06-05
JP2009504701A (ja) 2009-02-05
AU2006281566A1 (en) 2007-02-22
NO20080754L (no) 2008-05-15
US20090028828A1 (en) 2009-01-29
CA2619751A1 (fr) 2007-02-22
EP1915173A2 (fr) 2008-04-30
DK2233153T3 (da) 2015-04-27
CA2619751C (fr) 2016-07-05

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